advise please:)

So I'm approximately 5 weeks pregnant :) for about a week I was having really mild cramps or twinges once every couple of hours which im assuming is normal since everything is changing. but the past 2 days particularly at night it is so sore! again on and off but more frequently. if I wasn't pregnant my AF would be here now maybe that's it? normally I would be crawling the bed in pain with AF and it isn't quite at that stage but not far off. Just really want to know is this all normal body changes mixed with the fact that AF should be here etc? Or something to be concerned about ?